Nonheme iron accounts for the remaining 90% but it is less well absorbed (about. Selenium: functions, antioxidant, sources, seafood, kidney, liver, eggs, grains, nuts, seeds, deficiency, keshan disease, heart disease in china, increased risk of cancer. Chromium: functions, helps insulin in your body, increases effectiveness in cells, may improve blood glucose control, does not help build muscle mass, food sources, grains, meat, fish, poultry, some fruits and vegetables. Iodine: functions, needed for synthesis of thyroid hormones (regulate metabolic rate, growth and development and promote protein synthesis, deficiency, goiter, enlarged thyroid, sources, seafood, iodized salt, food contaminants and additives. Manganese: functions, carbohydrate and cholesterol metabolism and antioxidant enzymes, sources, whole grains, nuts, legumes, leafy green vegetables. Molybdenum: functions, cofactor for a number of enzymes, sources, milk and milk products, organ meats, breads, cereals, legumes. Additional minerals: arsenic, may be needed in the metabolism of a specific amino acid in rats.